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【多选题】
常用的粉碎方法包括（ ）A.
干法粉碎
B.
湿法粉碎
C.
低温粉碎
D.
超细粉碎
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皮皮学刷刷变学霸
举一反三
【单选题】The two birds ________ each other in shape and color, in other words, they ________ each other in shape and color. [ ]
A.
differ; are different from
B.
differ from; are different with
C.
resemble; are similar to
D.
resemble; are similar with
【单选题】each lifeboat shall be launched with its assigned operating crew aboard and maneuvered in the water at least ___ during an abandon ship drill.
A.
once every month
B.
once every two months
C.
once every three months
D.
once every six months
【单选题】Each lifeboat must be lowered and maneuvered in the water at least once every（）.
A.
2 months
B.
3 months
C.
4 months
D.
5 months
【简答题】根据液压泵与执行元件的组合方式不同,容积调速回路有四种形式,即 变量泵-液压缸 容积调速回路 变量泵-定量马达 容积调速回路、( )容积调速回路、( )容积调速回路。
【简答题】设两个随机变量X，Y相互独立，且都服从均值为0、方差为1/2的正态分布，求随机变量|X-Y|的方差．
【简答题】《红楼梦》中的贾宝玉即是全书开篇神话中的()，他脖子上的通灵宝玉则是神话中的青埂峰的顽石。
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